Recycling of polyurethane

Abstract

The present invention relates to a process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), wherein the mixture (M-PU) comprises at least a polyurethane (PU1) and a polyurethane (PU2). According to the present invention, polyurethane (PU1) and (PU2) differ in the density and / or the chemical composition; and polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the properties P2, the process comprising the steps of providing the polymer composition (PC) and subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing.

Description

Recycling of polyurethaneThe present invention relates to a process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), wherein the mixture (M-PU) comprises at least a polyurethane (PU1) and a polyurethane (PU2). According to the present invention, polyurethane (PU1) and (PU2) differ in the density and / or the chemical composition; and polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the properties P2, the process comprising the steps of providing the polymer composition (PC) and subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing.Waste disposal and recycling is an important aspect for the chemical industry and in particular for polyurethane foams. The extensive industrial use of polyurethane materials and the production thereof is accompanied by a considerable accumulation of waste or scrap of these polyurethane materials. A large quantity of polyurethane material scrap is generated during the slabstock manufacturing process. In such operations, from 10% to about 30% of the virgin polyurethane materials may end up as scrap. This scrap polyurethane material may be reused, for instance by grinding it to polyurethane powder and adding this powder as a filler in the polyurethane formulation, or in a rebonding process wherein the waste foam fragments are bonded to each other by means of a binder to produce carpet underlays, pillow fillings or athletic mats.The largest amount of polyurethane material scrap, however, is constituted by end of life (EoL) polyurethane foam. The main waste processing technologies for this EoL polyurethane foam include incineration and landfill. But besides representing an environmental pollution problem, such disposal techniques have an economic loss associated with both the land required for landfill and the permanent loss of costly materials used in the preparation of polyurethane materials. Therefore, the main interest is to consider the recovery and eventual reuse of such materials.For recycling processes it is advantageous to sort the waste material and use waste streams which have a defined composition to yield recovered raw materials with similar properties, so that these can eventually be employed to replace the virgin raw material compounds needed to prepare new polyurethane materials.For example US 2023264391 A1 discloses a method for separating waste polyurethane foams, based on spectroscopic methods.However, no information is provided which criteria have to be met with respect to the composition and the amount of additives in the composition to allow to recycle the waste streams to a high degree.It was an object of the present invention to provide a process for recycling polymer compositions comprising polyurethanes which allow to reuse the materials obtained to a high degree.According to the present invention, this object was achieved by a process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising, preferably consisting of at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing.Polymer composition (PC) comprises a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC). According to an alternative embodiment, the polymer composition comprises the polyurethane mixture (M-PU) in an amount of from 5 to less than 30 % by weight based on the weight of the polymer composition (PC), preferably from 10 to less than 30 % by weight based on the weight of the polymer composition (PC), in particular from 15 to less than 30 % by weight based on the weight of the polymer composition (PC).The mixture (M-PU) comprises at least a polyurethane (PU1) and a polyurethane (PU2) and may comprise further polyurethanes. According to a further embodiment, the present invention is directed to the process as disclosedabove, wherein mixture (M-PU) comprises polyurethanes in an amount of at least 5% by weight, preferably at least 10 % by weight, more preferable at least 15 % by weight, more preferable in an amount of 40 to 100 % by weight, preferably 50 to 100% by weight, more preferably 80 to 100 % by weight, more preferably 90 to 100 % by weight, more preferably 95 to 100 % by weight, based on the mixture (M-PU).Polyurethanes are well known. They are prepared by reaction of isocyanates with isocyanate-reactive com- pounds / polyol having an average molecular weight of 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol, and optionally chain extenders having a molecular weight of 50 g / mol to 499 g / mol, optionally in the presence of catalysts and / or customary auxiliaries and / or additives. Suitable polyurethanes and processes for their preparation are in principle known to the person skilled in the art.Preferably, mixture (M-PU) consists of polyurethanes and may also consist of polyurethane (PU1) and (PU2) but may also comprise further polyurethanes. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein mixture (M-PU), preferably the polymer composition (PC), consists of polyurethanes.Preferably, the content of polyurethane (PU-1) in mixture (M-PU) is in the range of from 1 to 99% by weight, more preferable in the range of from 5 to 95% by weight, more preferable in the range of from 10 to 90% by weight, more preferable in the range of from 20 to 80% by weight, more preferable in the range of from 30 to 70% by weight, more preferable in the range of from 40 to 60% by weight, more preferable in the range of from 45 to 55% by weight, in each case based on the weight of mixture (M-PU).Preferably, the content of polyurethane (PU-2) in mixture (M-PU) is in the range of from 1 to 99% by weight, more preferable in the range of from 5 to 95% by weight, more preferable in the range of from 10 to 90% by weight, more preferable in the range of from 20 to 80% by weight, more preferable in the range of from 30 to 70% by weight, more preferable in the range of from 40 to 60% by weight, more preferable in the range of from 45 to 55% by weight, in each case based on the weight of mixture (M-PU).It has surprisingly been found that the polymer composition (PC) can be advantageously subjected to recycling processes and the yields and quality of the products obtained in the process is improved.The process of the present invention comprises steps (I) and (II) and may comprise further steps. According to step (I), the polymer composition (PC) is provided and subsequently subjected to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing according to step (II). Preferably, the recycling process is selected from melting or depolymerizing.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein step (II) comprises a melt emulsification comprising mixing the polymer composition (PC) and a dispersion medium andforming a mixture; shearing the mixture to form a dispersion of droplets of the composite in a liquid phase under a temperature of 160 to 250 °C; cooling the dispersion under a temperature of 0 to 100 °C and obtaining a polymer polyol.Regarding the polymeric composition (PC) which is provided according to (I), it is preferred that it is provided in solid form, more preferably in the form of particles such as granules. The polymeric composition (PC) preferably is an end- of-life material. In a preferred embodiment, the polymer composition (PC) is mechanically comminuted to an average particle size from 0.1 to 50 mm, preferably from 1 to 20 mm. The comminution can be carried out in a commercial mill, for example in a cutting mill, or, preferably, in particular when the compositions used contain hard materials such as metal inserts, for example bolts, in a hammer mill.The term "particle” as used in this context of the present invention comprises optionally pre-formed granules, and also comprises shredded piecesPreferably, the process comprises further treatment steps such as for example a step of comminuting the polymer composition (PC). According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the process further comprises(1.1) comminuting of the polymer composition (PC).The polymer composition (PC) comprises mixture (M-PU) but may also comprise further components such as solvents or further polymers. The polymer composition (PC) may for example comprise further polymers, in particular thermoplastic polymers. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the polymer composition (PC) comprises one or more solvents. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the polymer composition (PC) comprises one or more thermoplastic(s), thermoset(s) and / or elastomer(s), preferably thermoplastic(s) and / or ther- moset(s), more preferably thermoset(s).Further thermoplastic materials which may be present in the polymer composition (PC) preferably are selected from polyolefins or polyesters.Preferably, the polymer composition (PC) has a high content of polyurethanes. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein composition (PC) comprises the polyurethane mixture (M-PU) in an amount from 40 to 100 % by weight based on the weight of the polymer composition (PC), preferably in an amount of from 40 to 95 % by weight based on the weight of the polymer composition (PC), in particular in an amount of from 50 to 90 % by weight based on the weight of the polymer composition (PC).Suitable compositions may for example comprise end of life materials and waste. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the polymer composition (PC) is part of waste stream (W).Waste streams and suitable methods for sorting waste streams to obtain polymer composition (PC) are in principle known to the person skilled in the art. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the polymer composition (PC) is post industrial and / or post consumer waste, preferably comprises one or more selected from mattress, cushions, insulation, interior lining of motor vehicles, seat cushions, furniture, acoustic elements and bike saddles or parts thereof.According to the present invention, polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(p) the chemical composition.Polyurethanes (PU1) and (PU2) may differ in the density and have the same chemical composition or polyurethanes (PU1) and (PU2) may have the same chemical composition and differ in the density or polyurethanes (PU1) and (PU2) may differ in the chemical composition and differ in the density.The density of polyurethanes (PU1) and (PU2) may vary in broad ranges. It is for example possible that one or both of polyurethanes (PU1) and (PU2) are foams or that one of polyurethanes (PU1) and (PU2) is a compact material or a compressed foam. Polyurethanes (PU1) and (PU2) may be rigid foams or flexible foams according to the present invention. It is also possible in the context of the present invention that polyurethane (PU1) is a foam and polyurethane (PU2) is the skin of the foam, i.e. a region at the surface of the foam with a higher density. Suitable methods to determine the density are in principle known to the person skilled in the art. The average density may for example be calculated. The core density may be determined according to DIN EN ISO 845.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the density between polyurethane (PU1) and (PU2) is 0.1 g / cm3or more, preferably 0.2 g / cm3or more, more preferably 0.3 g / cm3or more, more preferably 0.4 g / cm3or more, more preferably 0.5 g / cm3or more, more preferably 0.6 g / cm3or more, more preferably 0.7 g / cm3or more, more preferably 0.8 g / cm3or more, more preferably 0.9 g / cm3or more, more preferably 1 g / cm3or more.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the density between polyurethane (PU1) and (PU2) is 3 g / cm3or less, preferably 2 g / cm3or less, more preferably 1 .5 g / cm3or less.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein polyurethane (PU1) or polyurethane (PU2) is a soft and / or flexible foam, preferably a foam with a density in the range of from 45 to 400 g / l. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein polyurethane (PU1) or polyurethane (PU2) is a thermoplastic polyurethane, preferably a compact thermoplastic polyurethane.The polyurethanes (PU1) and (PU2) may also differ in the chemical composition. According to the present invention, two polyurethanes have a different chemical composition in case the chemical composition differs in at least one feature in an amount of 0.25% of a given feature. The chemical composition of the polyurethanes is mainly dependent on the starting materials used, in particular the isocyanates used and the components which have functional groups reactive towards isocyanates, in particular the polyols used. Furthermore, the chemical composition of the polyurethanes is dependent on the functionality of the components used, catalysts used, blowing agents used and the ratio of the components. The chemical composition may be determined by suitable methods such as elemental analysis or spectroscopic methods. A suitable spectroscopic method is for example IR Spectroscopy.The chemical composition in the context of the present invention encompasses for example the chemical nature of the isocyanates used. Suitable isocyanates used for the preparation of polyurethanes are known to the person skilled in the art. Polyurethanes (PU1) and (PU2) preferably are prepared from tolylene 2,4- and / or 2,6-diisocyanate (TDI), or 2,2'-, 2,4'- and / or 4,4'-diisocyanate (MDI), or mixtures of monomeric diphenylmethane diisocyanates and higher polycyclic homologs of diphenylmethane diisocyanate (polymer MDI), in particular from 2,2'-, 2,4'- and / or 4,4'-diisocy- anate (MDI), or mixtures of monomeric diphenylmethane diisocyanates and higher polycyclic homologs of diphenylmethane diisocyanate (polymer MDI).According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is determined based on the isocyanate used for the preparation.The chemical composition in the context of the present invention furthermore encompasses the chemical nature of the polyols used. Suitable polyols used for the preparation of polyurethanes are known to the person skilled in the art. Polyols may for example vary with respect to the chemical nature of the polyol, the functionality and the molecular weight. Polyurethanes (PU1) and (PU2) may be prepared from suitable polyols or mixtures thereof, for example polyesterols or polyetherols or mixtures thereof. Suitable are for example polyester- or polyetherpolyols having a functionality between 1.7 and 5 in each case, and it is also possible in accordance with the invention to use two or more polyester- or polyetherpolyols or mixtures of polyester- and polyetherpolyols. A "polyester- or polyetherpolyol having a functionality of xx" is understood to mean a nominally xx-functional polyester- or polyetherpolyol. The average molecular weight Mn of the polyols is preferably between 500 g / mol and 10 000 g / mol, preferably between 800 g / mol and 7000 g / mol, especially between 1000 g / mol and 6000 g / mol. Polyols are fundamentally known to thoseskilled in the art and described for example in "Kunststoffhandbuch, Band 7, Polyurethane” [Plastics Handbook, volume 7, Polyurethanes], Carl Hanser Verlag, 3rd edition 1993, chapter 3.1.The functionality of the components used and additives and catalysts used in the preparation of the polyurethanes influences the properties of the polymers obtained, such as for example the average molecular weight of the polyurethanes, the degree of crosslinking, the content of urea bonds or the content of reactive sites within the polymer. These properties of the polyurethanes (PU1) and (PU2) are suitable to determine if the polyurethanes have difference in the chemical composition and may be determined using suitable methods, in particular spectroscopic methods or elemental analysis. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is determined based on the content of urea bonds.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is measured by elemental analysis. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is measured by elemental analysis and the value for carbon C differs 1 % or more, preferably 2 % or more, more preferably 3 % or more, more preferably 5 % or more, more preferably 10 % or more. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is measured by elemental analysis and the value for hydrogen H differs 1 % or more, preferably 2 % or more, more preferably 3 % or more, more preferably 5 % or more, more preferably 10 % or more.According to the present invention, polyurethane (PU1) and (PU2), and preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%.According to a further embodiment, polyurethane (PU1) and (PU2), and preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%;(h) the melting point is 220°C or more, preferably 240°C or more, more preferably 250 °C or more;(i) the polyurethane is a duroplastic polyurethane.Polyurethanes (PU1) and (PU2) and the mixture (M-PU) may exhibit one or more of the features (a) to (g) or (a) to (i) respectively.According to one embodiment of the presnt invention, (PU1) or (PU2) or (PU1) and (PU2) are duroplastic materials. Preferably, (PU1) and (PU2) are duroplastic materials. The content of duroplastic material in the mixture (M-PU) may for example be more than 1 % by weight, preferably more than 5 % by weight, in particular more than 10% by weight, preferably in the range of from 15% by weight to 100% by weight, in particular in the range of from 20 to 90% by weight, in each case based on the weight of mixture (M-PU).It has been found that it is particularly advantageous for recycling purposes when the polyurethanes (PU1) and (PU2) have a low content of fillers, in particular fibrous fillers such as glass fibers, or carbon black. The content of fillers, carbon black and black paste in the polyurethanes can be determined using known methods. The polyurethanes may for example be dissolved to determine the amount of insoluble fillers and pigments or spectroscopic methods may be used.Preferably, the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%; and / or the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%; and / or the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the content of pigments and fillers in polyurethane (PU-1 ) and polyurethane (PU-2) is less 5% by weight based on the weight of the polyurethane.Preferably, polyurethanes (PU1) and (PU2) have a content of polyester based polyurethane of 5 weight- % or less, preferably in the range of from 0.1 to 5 weight-%;For chemical recycling, it is particularly advantageous when the content of polyester in the polymer composition is low and also the content of polyester based polyurethanes. In the context of the present invention, polyester based polyurethanes are polyurethanes which are prepared using polyesterpolyols. Polyesters or polyester based polyurethanes can easily decompose under the conditions of chemical recycling processes and the polyols cannot be recovered in the recycling process but only the respective monomers of the polyester. This makes the recycling processes inefficient and the separation of the products more complicated.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the content of ester based polyurethanes in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition (PC), preferably less than 6 % by weight, in particular in the range of from 0.1 to 5 % by weight. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the content of polyesters in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition (PC), preferably less than 5 % by weight, in particular in the range of from 0.1 to 2.5 % by weight.Furthermore, in polyurethane (PU1) and (PU2), the content of chain extender in the polyurethane preferably is 5 weight-% or less, in particular in the range of from 0.1 to 5 weight-%. Chain extenders are preferably aliphatic, arali- phatic, aromatic and / or cycloaliphatic compounds having a molecular weight of 50 g / mol to 499 g / mol, preferably with a functionality of 2 or also 3 to 5. Suitable chain extenders are known to the person skilled in the art. The content of chin extender can for example be determined using spectroscopic methods.Preferably, the average molecular weight of the polyol used for the preparation of the polyurethane (PU1) and (PU2) is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol. The average molecular weight may be determined by gel permeation chromatography.It has furthermore been found that it is advantageous when polyurethane (PU1) and / or polyurethane (PU2) have a melting point of 300°C or less, preferably 250°C or less, more preferably 200 °C or less. This is particularly advantageous for recycling processes which comprise melting of the polymer composition. The melting temperature may be determined via DSC, measured based on DIN EN ISO 11357-3:2013.Polyurethane (PU1) and (PU2) differ in one or more of the properties P1 and polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the properties P2. Several combinations of the above properties P1 and P2 are possible in the context of the present invention.According to the present invention, it is possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (a) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (b) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (c) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (d) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (e) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (f) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (b) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (c) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (d) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (e) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (f) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (c) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (d) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (e) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (f) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (d) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (e) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (f) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (e) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (f) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (f) or (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (f) and (g).According to the present invention, it is possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (a) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (b) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (c) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (d) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M- PU), exhibit(s) property (e) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (f) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (g).It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (b) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (c) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (d) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (e) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (f) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (c) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (d) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (e) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (f) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (d) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (e) or (PU1) and (PU2) differ in thechemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (f) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (e) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (f) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (f) or (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (f) and (g).According to the present invention, it is possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (a) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibits) property (b) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (c) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (d) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (e) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M- PU), exhibit(s) property (f) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (g) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (h) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) property (i).It is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (b) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (c) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (d) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (e) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (f) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (c) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (d) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (e) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (f) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (d) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (e) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (f) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (e) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (f) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M- PU), exhibit(s) properties (d) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (f) or (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (f) and (g).According to the present invention, it is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 3 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 4 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibits) 5 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 6 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) all 7 of properties (a) to (g).According to the present invention, it is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 3 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 4 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 5 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 6 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) all 7 of properties (a) to (g).According to the present invention, it is also possible that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 3 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 4 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 5 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) 6 of properties (a) to (g), or that polyurethane (PU1) and (PU2) differ in the density and the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) all 7 of properties (a) to (g).It is also possible that polyurethane (PU1) and (PU2) differ in the density and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (h) and / or (I) alone or in combination with any one or several of properties (a) to (g). It is also possible that polyurethane (PU1) and (PU2) differ in the chemical composition and (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (h) and / or (I) alone or in combination with any one or several of properties (a) to (g).According to step (II) of the process according to the present invention, the polymer composition (PC) is subjected to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. Suitable recycling processes are in principle known to the person skilled in the art.For recycling processes including gasifying and pyrolyzing, it is advantageous to use the polymer composition (PC) according to the present invention. The improved purity for the pyrolysis reaction results in an improved product, in terms of purity and homogeneity, is obtained from the pyrolysis reaction.Also for depolymerization processes including chemical degradation reaction, such as for example catalytic depolymerization, hydrogenation or lysis processes, specifically hydrolysis, the specific composition of polymer composition (PC) is advantageous. The controlled depolymerization gives rise to known degradation compounds, which can be recovered from the resulting mixture. In particular a low content of polyesters is advantageous for the depolymerization of polyurethanes.The specific polymer composition (PC) used according to the present invention is also advantageous for recycling processes including melting of the composition. Polymer composition (PC) preferably can be subjected to further treatment steps, in particular recycling steps without further dismantling. According to a preferred embodiment of the present invention, the polymer composition can be liquefied by heating and converted from a liquid state or melt into granules. The granules can be reconverted into moldings by known methods of thermoplastic processing.The defined composition of polymer composition (PC) according to the present invention allows to use the composition in recycling processes which comprise melt-emulsification steps. According to a particularly preferred embodiment, step (II) may comprise a melt emulsification comprising, mixing the polymer composition (PC) and a dispersion medium and forming a mixture; shearing the mixture to form a dispersion of droplets of the composite in a liquid phase under a temperature of 160 to 250 °C; cooling the dispersion under a temperature of 0 to 100 °C and obtaining a polymer polyol. Suitable processes are in principle known to the person skilled in the art.Preferably, the polymer composition (PC) and the dispersion medium are mixed by an extruder. Preferably, the polymer composition (PC) is melt-emulsifiable in the dispersion medium under a temperature lower than 250 °C. The term "melt-emulsifiable” means the ability of a polymer to be dispersed in the dispersion medium under an operational temperature. Being melt-emulsifiable under a certain temperature does not necessarily mean the polymer will melt under such temperature.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein step (II) comprises the steps of(I) melting the polymer composition (PC);(II) mixing the melt with a compound (C) to obtain a mixture (M 1 );(ill) preferably reacting the mixture (M 1) with a compound comprising isocyanate.According to a further embodiment, the present invention therefore is also directed to a process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(1.1) comminution of the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing; wherein step (II) comprises the steps of(i) melting the polymer composition (PC);(ii) mixing the melt with a compound (C) to obtain a mixture (M 1 );(iii) preferably reacting the mixture (M 1) with a compound comprising isocyanate.According to a further embodiment, the present invention therefore is also directed to a process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%;(h) the melting point is 220°C or more, preferably 240°C or more, more preferably 250 °C or more;(I) the polyurethane is a duroplastic polyurethane; the process comprising(I) providing the polymer composition (PC);(1.1) comminution of the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing; wherein step (II) comprises the steps of(i) melting the polymer composition (PC);(ii) mixing the melt with a compound (C) to obtain a mixture (M 1 );(iii) preferably reacting the mixture (M 1) with a compound comprising isocyanate.For melt-emulsification, it is particularly advantageous to use a composition (PC) with polyurethanes (PU1) and (PU2) with the same chemical composition. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein polyurethane (PU1) and polyurethane (PU2) have the same chemical composition. It is for example possible that polyurethane (PU1) and polyurethane (PU2) are parts of one composite element and preferably are connected. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the polyurethane (PU1) and (PU2) are connected, preferably in a form-fitting, force-fitting or material-locking manner. Suitable composites comprising polyurethanes (PU1) and (PU2) are for example parts of interior lining of motor vehicles, seat cushions, furniture, acoustic elements, footwear, sports equipment, matrasses and bike saddlesPolyurethanes (PU1) and (PU2) may for example have the same chemical composition and differ in the density. It is for example possible that one of polyurethanes (PU1) or (PU2) is a foam and the other polyurethane is a compacted or compact material with the same chemical composition, such as for example a skin or compacted foam layer. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein polyurethane (PU1) and polyurethane (PU2) are parts of one composite element.According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the melting point of polyurethane (PU1) and the melting point of polyurethane (PU-2) is below 250°C, preferably below 200°C.In step (II), the melt is mixed with a compound (C) to obtain a mixture (M1). According to the present invention, compound (C), i.e. the dispersion medium preferably comprises a polyhydroxy oligomer or polymer selected from a polyester polyol, a polyether polyol, a polycarbonate polyol, and any combination thereof. Preferably, the dispersion medium, due to existence of hydroxyl groups, is an isocyanate reactive medium and may be used for production of polymers, for example, polyurethane. According to a further embodiment, the present invention is directed to the process as disclosed above, wherein the compound (C) is a polyol.Suitable polyols have for example an overall OH number of 20 to 1 ,000 mgKOH / g. Preferably, the polyol has an average functionality of 1 .5 to 6. Suitable polyols are for example polyester polyols, polyether polyols, polycarbonate polyols which are known in the art. According to step (ii), a polymer polyol is provided, which is prepared from the process of recycling polymer wastes. The polymer polyols may be used in a variety of applications, inter alia, PU foams, PU elastomers, thermoplastic polyurethanes (TPU), PU coatings, PU sealants, PU adhesives, surfactants, lubricants, dispersants, and concrete liquefiers.According to a further aspect, the present invention is also directed to a process, preferably a process as disclosed above, wherein in the recycling process a composition Q is formed.The present invention is also directed to the product obtained or obtainable in the process as disclosed above.According to a further aspect, the present invention is also directed to a process, preferably a process as disclosed above, comprising the step: converting a chemical material obtainable by or obtained by the process as disclosed above and / or the composition Q obtainable by or obtained by the process as disclosed above to obtain a product.According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the product is selected from:I) building block or monomer; orII) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; or ill) cleaning polymer, cleaning surfactant, descaling compound, cleaning biocide or composition or formulation thereof; or iv) agrochemical composition, agrochemical formulation auxiliary or agrochemically active ingredient; or v) active pharmaceutical ingredient or intermediate thereof, pharmaceutical excipient, animal feed additive, human food additive, dietary supplements, aroma chemical or aroma composition; orvi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acrylate hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curable acrylic polymer for hot melts and coatings polyisocyanates, hyperbranched polyester polyol, polymeric dispersant for inorganic binder compositions, unsaturated polyester polyol or 100% curable composition; or vii) cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the content of the polymer composition (PC) in the product is 1 weight-% or more, preferably 2 weight-% or more, more preferably 5 weight-% or more, more preferably 15 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 60 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or wherein the content of the polymer composition (PC) in the product is 100 weight-% or less, preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 50 weight-% or less, more preferably 25 weight-% or less, more preferably 10 weight-% or less; and preferably wherein the content is determined based on identity preservation and / or segregation and / or mass balance and / or book and claim chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.The publication Prior Art Disclosure; Issue 684; paragraphs

[1000] to

[8005] ; ISSN: 2198-4786; published: February 12, 2024 will be regarded as Reference RF1, which is incorporated herein by reference in its entirety. Preferably, the product is a product as described in Reference RF1; paragraphs

[1000] to

[8005] , Preferably, the process described herein is further a process for the production of a product.The converting step to obtain the product preferably comprises one or more step(s) as described below and can be performed by conventional methods well known to a person skilled in the art. The converting step preferably comprises one or more step(s) selected from: recycling, preferably depolymerizing, gasifying, pyrolyzing, and / or steam cracking; and / or purifying, preferably crystallizing, (solvent) extracting, distilling, evaporating, hydrotreating, absorbing, adsorbing and / or subjecting to ion exchanger; and / or assembling, preferably foaming, synthesizing, chemical conversion, chemically transforming, polymerizing and / or compounding; and / or forming, preferably foaming, extruding and / or molding; and / or finishing, preferably coating and / or smoothing.In addition, the one or more step(s) are described in detail in Reference RF1; paragraphs

[1000] to

[8005] ,The term "building block”, as used herein, comprises compounds, which are in a gaseous or liquid state under standard conditions of 0°C and 0.1 MPa. Building blocks are typically used in chemical industry to form secondary products, which provide a higher structural complexity and / or higher molecular weight than the building block on which the secondary product is based. The building block is preferably selected from the group consisting of hydrogen, carbon monoxide, carbon dioxid, ethylene oxide, ethylene glycols, syngas comprising a mixture of hydrogen and carbon monoxide, alkanes, alkenes, alkynes and aromatic compounds. The alkanes, alkenes, alkynes and aromatic compounds comprise in particular 1 to 12 carbon atoms, respectively.The term "monomer”, as used herein, comprises molecules, which can react with each other to form polymer chains by polymerization. The monomer is preferably selected from the group consisting of (meth)acrylic acid, salts of (meth)acrylic acid; in particular sodium, potassium and zinc salts; (meth)acrolein and (meth)acrylates. (Methacrylates comprising 1 to 22 carbon atoms are preferred, in particular comprising 1 to 8 carbon atoms. The terms (meth)acrylic acid, (meth)acrolein or (meth)acrylate relate to acrylic acid, acrolein or acrylate and also to methacrylic acid, methacrolein or methacrylate, where applicable. Further, the monomer can be selected from hexamethylenediamine (HMD) and adipic acid.The building block can further be an intermediate compound. The term "intermediate compound”, as used herein, comprises organic reagents, which are applied for formation of compounds with higher molecular complexity. The intermediate compound can be selected for example from the group consisting of phosgene, polyisocyanates and propylene oxide. The polyisocyanates are in particular aromatic di- and polyisocyanates, preferably toluene diisocyanate (TDI) and / or diphenylmethane diisocyanate (MDI).The building block and the monomer and typical converting step(s) to obtain the building block or monomer are described in more detail in paragraphs

[1000] to

[1012] of Reference RF1.The term "polymer A”, as used herein, comprises thermoplastic, e.g., polyamide or thermoplastic polyurethane, thermoset, e.g., polyurethane, elastomer, e.g., polybutadiene, or a copolymer or a mixture thereof and is defined in more detail in paragraphs

[2001] to

[2007] of Reference RF1.The term "polymer composition A”, as used herein, comprises all compositions comprising a polymer as described above and one or more additive(s), e.g. reinforcement, colorant, modifier and / or flame retardant, and is defined in more detail in paragraph

[2008] of Reference RF1.The term "polymer product A”, as used herein, comprises any product comprising the polymer A and / or polymer composition A as described above and is defined in more detail in paragraphs

[2009] and

[2010] of Reference RF1 .The step(s) to obtain the polymer, preferably polymer A, polymer composition, preferably polymer composition A or polymer product, preferably polymer product A is / are described in more detail in paragraph

[2011] of Reference RF1 .The term "industrial use polymer”, as used herein, comprises rheology, polycarboxylate, alkoxylated polyalkylenamine, alkoxylated polyalkylenimine, polyether-based, dye inhibition and soil release cleaning polymers defined in more detail in paragraphs

[3035] to

[3044] of Reference RF1. The term "industrial use surfactant”, as used herein, comprises non-ionic, anionic and amphoteric industrial use surfactants defined in more detail in paragraphs

[3008] to

[3034] of Reference RF1. The term "industrial use descaling compound”, as used herein, comprises non-phosphate based builders (NPB) and phosphonates (CoP) described in more detail in paragraphs

[3001] to

[3005] of Reference RF1. The term "industrial use biocide”, as used herein, refers to a chemical compound that kills microorganisms or inhibits their growth or reproduction defined in more detail in paragraphs

[3006] to

[3007] of Reference RF1 . The term "industrial use solvent”, as used herein, comprises alkyl amides, alkyl lactamides, alkyl esters, lactate esters, alkyl diester, cyclic alkyl diester, cyclic carbonates, aromatic aldehydes and aromatic esters defined in more detail in paragraphs

[3045] to

[3055] of Reference RF1. The term "industrial use dispersant”, as used herein, comprises anionic and non-ionic industrial use dispersants defined in more detail in paragraphs

[3056] to

[3058] of Reference RF1 . The term "composition and / or formulation thereof' with reference to the industrial use polymers, industrial use surfactants, descaling compounds and / or industrial use biocides refers to industrial use compositions and / or institutional use products and / or fabric and home care products and / or personal care products defined in more detail in paragraph

[3059] of Reference RF1. The converting step(s) to obtain the industrial use polymer, industrial use surfactant, descaling compound and / or industrial use biocide are defined in more detail in paragraph

[3060] of Reference RF1. The converting steps to obtain the industrial use composition or formulation of the industrial use polymer, industrial use surfactant, descaling compound and / or industrial use biocide are defined in more detail in paragraph

[3061] of Reference RF1.The term "agrochemical composition”, as used herein, typically relates to a composition comprising an agrochemi- cally active ingredient and at least one agrochemical formulation auxiliary. Examples of agrochemical compositions, active ingredients and auxiliaries are described in more detail in Reference RF1, paragraph

[4001] ,The agrochemical composition may take the form of any customary formulation. The agrochemical compositions are prepared in a known manner, e.g. described by Mollet and Grubemann, Formulation technology, Wiley VCH, Weinheim, 2001; or Knowles, New developments in crop protection product formulation, Agrow Reports DS243, T&F Informa, London, 2005. The converting step(s) to obtain the agrochemically active ingredients and auxiliaries may be conducted in analogy to the production step(s) of their analogues that are based on petrochemicals or other precursors that are not gained by recycling processes. In addition, conversion to compounds mentioned in sections "Polymer” and "Cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or compositions or formulations thereof' may be performed as described in these sections as well as the respective paragraphs in Reference RF1.The term active pharmaceutical ingredients and / or intermediates thereof, as used herein, comprises substances that provide pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body. Intermediates thereof are isolated products that aregenerated during a multi-step route of synthesis of an active pharmaceutical ingredient. The term pharmaceutical excipients, as used herein, comprises compounds or compound mixtures used in compositions for various pharmaceutical applications, which are not substantially pharmaceutically active on itself. Active pharmaceutical ingredients and / or intermediates thereof and pharmaceutical excipients are defined in more detail in paragraph

[5001] of Reference RF1.The converting step(s) to obtain the active pharmaceutical ingredients and / or intermediates thereof and pharmaceutical excipients may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The terms animal feed additives, human food additives, dietary supplements, as used herein, comprises Vitamins, Pro-Vitamins and active metabolites thereof including intermediates and precursors, especially Vitamin A, B, E, D, K and esters thereof, like acetate, propionate, palmitate esters or alcohols thereof like retinol or salts thereof and any combinations thereof; Tetraterpenes, especially isoprenoids like carotenoids and xanthophylls including their intermediates and precursors as well as mixtures and derivates thereof, especially beta carotene, Canthaxanthin, Citranax- anthin, Astaxanthin, Zeaxanthin, Lutein, Lycopene, Apo-carotenoids, and any combinations thereof; organic acids, especially formic acid, propionic acid and salts thereof, such as sodium, calcium or ammonium salts, and any combinations thereof, such as but not limited to mixtures of formic acid and sodium formiate, propionic acid and ammonium propionate, formic acid and propionic acid, formic acid and sodium formiate and propionic acid, propionic acid and sodium propionate and formic acid and sodium formiate; glycerides of carboxylic acids and short and medium chain fatty acids, conjugated linoleic acids, such as omega-6 fatty acid (C18:2) methyl ester and 1 ,2-propandiol and beverage stabilizers, such as polyvinylpyrrolidone-polymer or polyvinylimidazole / polyvinylpyrrolidone-copolymer. Animal feed additives, human food additives and dietary supplements are defined in more detail in paragraph

[5002] of Reference RF1.The converting step(s) to obtain the animal feed additives, human food additives, dietary supplements may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The terms aroma chemical and aroma composition as used herein, comprise a volatile organic substance with a molecular weight between 70-250 g / mol comprising a functional group with a carbon skeleton of C5-C16 carbon atoms comprising linear, branched, cyclic, for example with a ring size of C5-C18, bicyclic or tricyclic aliphatic chains and but not necessarily one or more unsaturated structural elements like double bonds, triple bonds, aromatics or heteroaromatics and preferably the one or more additional functional groups are selected from alcohol, ether, ester, ketone, aldehyde, acetal, carboxylic acid, nitrile, thiol, amine. In one aspect, the aroma chemical is a terpene-based aroma chemical, for example selected from monoterpenes and monoterpenoids, sesquiterpenes and sesquiterpenoids, diterpenes, triterpenes or tetraterpenes. Aroma chemicals can be combined with further aroma chemicals to give anaroma composition. Aroma chemicals and aroma compositions are defined in more detail in paragraph

[5003] of Reference RF1.The converting step(s) to obtain the aroma chemical and aroma composition may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The term "aqueous polymer dispersion”, as used herein, comprises aqueous composition(s) comprising dispersed polymer(s) and is defined in more detail in the section

[6001] entitled "aqueous polymer dispersion” of Reference RF1. The dispersed polymer(s) may be selected from acrylic emulsion polymer(s), styrene acrylic emulsion poly- mer(s), styrene butadiene dispersion(s), aqueous dispersion(s) comprising composite particles, acrylate alkyd hybrid dispersion(s), polyurethane(s) (including UV-curable polyurethanes) and polyurethane - poly(meth)acrylate hybrid polymer(s). The term "emulsion polymer”, as used herein, comprises polymer(s) made by free-radical emulsion polymerization. Aqueous polyurethane dispersion(s) are defined in more detail in the section

[6002] entitled "Polyurethane dispersions” of Reference RF1. UV-curable polyurethane(s) is / are defined in more detail in the section

[6017] of Reference RF1. Polyurethane - poly(meth)acrylate hybrid polymer(s) is / are defined in more detail in the section

[6016] of Reference RF1 .The term "polymeric dispersant”, as used herein, comprises preferably polymer(s) comprising polyether side chain, in particular polycarboxylate ether polymer(s) and polycondensation product(s) defined in more detail in paragraph

[6020] entitled "Polymeric dispersant” of Reference RF1 .The converting (polymerization) step(s) to obtain the aqueous polymer dispersion(s) comprising emulsion polymer(s) is / are defined in more detail in the section

[6003] entitled "Emulsion polymerization” of Reference RF1.The converting (polymerization) step(s) to obtain the aqueous polyurethane dispersion(s) is / are defined in more detail in the section

[6014] entitled "Process for the preparation of aqueous polyurethane dispersions” and section [6017)] entitled "Aqueous UV-curable polyurethane dispersions, their preparation and use and compositions containing them” of Reference RF1 .Composition(s) and uses of aqueous polymer dispersion(s) and of polymeric dispersant(s) are defined in more detail in the following sections of Reference RF1 : section

[6004] entitled "Uses of aqueous polymer dispersions”, section

[6005] entitled "Binders for architectural and construction coatings” section

[6006] entitled "Binders for paper coating” section

[6007] entitled "Binders for fiber bonding” section

[6008] entitled "Adhesive polymers and adhesive compositions” section

[6015] entitled "Aqueous polyurethane dispersions suitable for use in coating compositions” section

[6016] entitled "Aqueous polyurethane - poly(meth)acrylate hybride polymer dispersions suitable for use in coating compositions”section

[6017] entitled "Aqueous UV-curable polyurethane dispersions, their preparation and use and compositions containing them” section

[6018] entitled "Inorganic binder compositions comprising polymeric dispersants and their use”

[6019] 100% curable coating compositionsUV-crosslinkable poly(meth)acrylate(s) and its / their uses are defined in more detail in section

[6009] entitled "UV- crossli nkable poly(meth)acrylates for use in UV-curable solvent-free hotmelt adhesives and their use for making pressure-sensitive self-adhesive articles” of Reference RF1.Polyisocyanate(s), composition(s) comprising them and their uses are defined in more detail in section

[6010] entitled "Polyisocyanates” of Reference RF1.Hyperbranched polyester polyol(s) and its / their uses are defined in more detail in section

[6011] entitled "Organic solvent based hyperbranched polyester polyols suitable for use in coating compositions” of Reference RF1. The converting step(s) to obtain the hyperbranched polyester polyols is / are defined in more detail in the section

[6012] entitled "Preparation of organic solvent based hyperbranched polyester polyols” of Reference RF1 . Coating compositions) comprising hyperbranched polyester polyol(s), polyisocyanate(s) and additive(s) and substrate(s) coated therewith are defined in more detail in section

[6013] entitled "Organic solvent based two component coating compositions comprising hyperbranched polyester polyols and polyisocyanates” of Reference RF1 .Unsaturated polyester polyol(s), solvent-based coating composition(s) comprising said unsaturated polyester pol- yol(s) and substrate(s) for coating with said coating composition(s) are defined in more detail in section

[6018] entitled "Organic solvent based coating composition comprising unsaturated polyester polyols” of Reference RF1.100% curable coating composition(s) is / are defined in more detail in section

[6019] of Reference RF1.Polymeric dispersant(s) for inorganic binder compositions is / are defined in more detail in section

[6020] of Reference RF1. The inorganic binder composition(s) comprising the polymeric dispersants and their use are defined in more detail in section

[6021] of Reference RF1. The converting step(s) to obtain the polymeric dispersant(s) are defined in more detail in section

[6020] of Reference RF1 . The term "inorganic binder composition” comprising the polymeric dispersant(s), as used herein, comprises preferably in particular hydraulically setting compositions and compositions comprising calcium sulfate and is defined in more detail in section

[6021] of Reference RF1 entitled "Inorganic binder compositions comprising the polymeric dispersant and their use”. Specific building material formulation(s) comprising polymeric dispersant(s) or building product(s) produced by a building material formulation comprising a polymeric dispersant are disclosed in more detail in section

[6021] of Reference RF1.The term "cosmetic surfactant”, as used herein, comprises non-ionic, anionic, cationic and amphoteric surfactants and is defined in more detail in paragraph

[7002] of Reference RF1. The term "emollient”, as used herein, refers to achemical compound used for protecting, moisturizing, and / or lubricating the skin and is defined in more detail in paragraph

[7003] of Reference RF1 . The term "wax”, as used herein, comprises pearlizers and opacifiers and is defined in more detail in paragraph

[7004] of Reference RF1. The term "cosmetic polymer”, as used herein, comprises any polymer that can be used as an ingredient in a cosmetic formulation and is defined in more detail in paragraph

[7005] of Reference RF1 . The term "UV filter”, as used herein, refers to a chemical compound that blocks or absorbs ultraviolet light and is defined in more detail in paragraph

[7006] of Reference RF1. The term "further cosmetic ingredient”, as used herein, comprises any ingredient suitable for making a cosmetic formulation. Several sources disclose cosmetically acceptable ingredients. E. g. the database Cosing on the internet pages of the European Commission discloses cosmetic ingredients and the International Cosmetic Ingredient Dictionary and Handbook, edited by the Personal Care Products Council (PCPC), discloses cosmetic ingredients. The term "composition and / or formulation thereof' with reference to the cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter and / or further cosmetic ingredient refers to personal care and / or cosmetic compositions or formulations defined in more detail in paragraph

[7007] of Reference RF1 . The converting step(s) to obtain the cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter or further cosmetic ingredient is / are defined in more detail in paragraph

[7008] of Reference RF1 .The terms "polymer B”, "polymer composition B”, "coating composition”, "other functional composition”, "foil”, "molded body”, "coating” and "coated substrate” are well known to the person skilled in the art and are defined in more detail from paragraph

[8000] to

[8005] of Reference RF1.The present invention is further illustrated by the following set of embodiments and combinations of embodiments resulting from the dependencies and back-references as indicated. In particular, it is noted that in each instance where a range of embodiments is mentioned, for example in the context of a term such as "The process of any one of embodiments 1 to 3", every embodiment in this range is meant to be explicitly disclosed for the skilled person, i.e. the wording of this term is to be understood by the skilled person as being synonymous to "The process of any one of embodiments 1, 2 and 3". Further, it is explicitly noted that the following set of embodiments represents a suitably structured part of the general description directed to preferred aspects of the present invention, and, thus, suitably supports, but does not represent the claims of the present invention.1 . A process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising, preferably consisting of, at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. The process according to embodiment 1 , wherein the process further comprises (1.1) comminuting of the polymer composition (PC). The process according to embodiment 1 or 2, wherein step (II) comprises the steps of(I) melting the polymer composition (PC);(II) mixing the melt with a compound (C) to obtain a mixture (M 1 );(ill) preferably reacting the mixture (M 1) with a compound comprising isocyanate. A process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(1.1) comminution of the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing; wherein step (II) comprises the steps of(I) melting the polymer composition (PC);(II) mixing the melt with a compound (C) to obtain a mixture (M 1 );(ill) preferably reacting the mixture (M 1) with a compound comprising isocyanate.5. The process according to any one of embodiments 1 to 4, wherein the polymer composition (PC) comprises one or more solvents.6. The process according to any one of embodiments 1 to 5, wherein mixture (M-PU) comprises polyurethanes in an amount of 40 to 100 % by weight, preferably 50 to 100% by weight, more preferably 80 to 100 % by weight, more preferably 90 to 100 % by weight, more preferably 95 to 100 % by weight, based on the mixture (M-PU).7. The process according to any one of embodiments 1 to 6, wherein mixture (M-PU), preferably the polymer composition (PC), consists of polyurethanes.8. The process according to any one of embodiments 1 to 7, wherein composition (PC) comprises the polyurethane mixture (M-PU) in an amount from 40 to 100 % by weight based on the weight of the polymer composition (PC), preferably in an amount of from 40 to 95 % by weight based on the weight of the polymer composition (PC), in particular in an amount of from 50 to 90 % by weight based on the weight of the polymer composition (PC).9. The process according to any one of embodiments 1 to 8, wherein the polymer composition (PC) is part of waste stream (W).10. The process according to any one of embodiments 1 to 9, wherein the polymer composition (PC) comprises one or more thermoplastic(s), thermoset(s) and / or elastomer(s), preferably thermopl astic(s) and / or thermosets), more preferably thermoset(s).11 . The process according to any one of embodiments 1 to 10, wherein the polymer composition (PC) is post industrial and / or post consumer waste, preferably comprises one or more selected from mattress, cushions, insulation, interior lining of motor vehicles, seat covers, furniture, acoustic elements and bike saddles or parts thereof.12. The process according to any one of embodiments 1 to 11, wherein polyurethane (PU1) or polyurethane (PU2) is a soft and / or flexible foam, preferably a foam with a density in the range of from 45 to 400 g / l.13. The process according to any one of embodiments 1 to 12, wherein polyurethane (PU1) or polyurethane (PU2) is a thermoplastic polyurethane.14. The process according to any one of embodiments 1 to 13, wherein polyurethane (PU1) and polyurethane (PU2) are parts of one composite element.15. The process according to any one of embodiments 1 to 14, wherein polyurethane (PU1) and polyurethane (PU2) have the same chemical composition.16. The process according to any one of embodiments 1 to 15, wherein the content of ester based polyurethanes in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition (PC).17. The process according to any one of embodiments 1 to 16, wherein the content of polyesters in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition (PC).18. The process according to any one of embodiments 1 to 17, wherein the content of pigments and fillers in polyurethane (PU-1) and polyurethane (PU-2) is less 5% by weight based on the weight of the polyurethane.19. The process according to any one of embodiments 1 to 18, wherein the melting point of polyurethane (PU1) and the melting point of polyurethane (PU-2) is below 250°C, preferably below 200°C.A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in the density, and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising of at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising of at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in the density and the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing.A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(p) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), have a melting point of 300°C or less, preferably 250°C or less, more preferably 200 °C or less and exhibit(s) one or more of the following properties P2:(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 : (a) the density, and(|3) the chemical composition; andwherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), are prepared from a polyol with an average molecular weight in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol; and exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(c) the content of chain extender in the polyurethane is 5 weight-% or less,(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%.(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising of at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), have a content of chain extender in the polyurethane of 5 weight-% or less and exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), have a content of glass fibers and / or carbon black and / or black paste of 5 weight-% or less, preferably 2 weight-% or less, more preferably of 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-% and exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less,(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 : (a) the density, and(p) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), has a content of polyester based polyurethane of 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-% and exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less,(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (b) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (c) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (d) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; andwherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (e) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (f) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (a) and (g) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (c) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; andwherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (d) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (e) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (f) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (b) and (g) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; andwherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (d) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (e) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (f) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (c) and (g) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; andwherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (e) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (f) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (d) and (g) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (f) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; andwherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (e) and (g) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process for treating a polymer composition (PC), preferably according to any one of embodiments 1 to 19, comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(|3) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) properties (f) and (g) and optionally one or more of the remaining following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(c) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. A process according to any one of embodiments 1 to 48, wherein the difference of the density between polyurethane (PU1) and (PU2) is 0.1 g / cm3or more, preferably 0.2 g / cm3or more, more preferably 0.3 g / cm3or more, more preferably 0.4 g / cm3or more, more preferably 0.5 g / cm3or more, more preferably 0.6 g / cm3or more, more preferably 0.7 g / cm3or more, more preferably 0.8 g / cm3or more, more preferably 0.9 g / cm3or more, more preferably 1 g / cm3or more. A process according to any one of embodiments 1 to 49, wherein the difference of the density between polyurethane (PU1) and (PU2) is 3 g / cm3or less, preferably 2 g / cm3or less, more preferably 1 .5 g / cm3or less. A process according to any one of embodiments 1 to 50, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is measured by elemental analysis. A process according to any one of embodiments 1 to 51 , wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is determined based on the content of urea bonds. A process according to any one of embodiments 1 to 52, wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is measured by elemental analysis and the value for carbon C differs 1 % or more, preferably 2 % or more, more preferably 3 % or more, more preferably 5 % or more, more preferably 10 % or more. A process according to any one of embodiments 1 to 53,wherein the difference of the chemical composition between polyurethane (PU1) and (PU2) is measured by elemental analysis and the value for hydrogen H differs 1 % or more, preferably 2 % or more, more preferably 3 % or more, more preferably 5 % or more, more preferably 10 % or more.55. A process according to any one of embodiments 1 to 55, wherein the compound (C) is a polyol and / or polyester polyol, preferably a polyol.56. A process according to any one of embodiments 1 to 55, wherein the polyurethane (PU1) and (PU2) are connected, preferably in a form-fitting, force-fitting or materiallocking manner.57. A process according to any one of the preceding embodiments, wherein in the recycling process a composition Q is formed.57. A process according to any one of embodiments 1 to 56, wherein the polyurethane (PU1) and (PU2) are di-, tri-, or higher functional.58. A process according to any one of embodiments 1 to 57, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less.59. A process according to any one of embodiments 1 to 58, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol.60. A process according to any one of embodiments 1 to 59, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(c) the content of chain extender in the polyurethane is 5 weight-% or less.61 . A process according to any one of embodiments 1 to 60, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%.62. A process according to any one of embodiments 1 to 61 , wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%.A process according to any one of embodiments 1 to 62, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%. A process according to any one of embodiments 1 to 63, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%. A process according to any one of embodiments 1 to 64, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(h) the melting point is 220°C or more, preferably 240°C or more, more preferably 250 °C or more. A process according to any one of embodiments 1 to 65, wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) the property:(I) the polyurethane is a duroplastic polyurethane. A process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising, preferably consisting of at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(р) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(с) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%;(h) the melting point is 220°C or more, preferably 240°C or more, more preferably 250 °C or more;(I) the polyurethane is a duroplastic polyurethane; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing. The process according to embodiment 67, wherein step (II) comprises a melt emulsification comprising mixing the polymer composition (PC) and a dispersion medium and forming a mixture; shearing the mixture to form a dispersion of droplets of the composite in a liquid phase under a temperature of 160 to 250 °C; cooling the dispersion under a temperature of 0 to 100 °C and obtaining a polymer polyol.. The process according to embodiment 67 or 68, wherein step (II) comprises the steps of(i) melting the polymer composition (PC);(ii) mixing the melt with a compound (C) to obtain a mixture (M 1 );(iii) preferably reacting the mixture (M 1 ) with a compound comprising isocyanate. The process according to any one of embodiments 67 to 69, wherein the polymer composition (PC) comprises one or more solvents. The process according to any one of embodiments 67 to 70, wherein mixture (M-PU) comprises polyurethanes in an amount of 80 to 100 % by weight based on the mixture (M-PU). The process according to any one of embodiments 67 to 71, wherein the polymer composition (PC) is part of waste stream (W) in particular wherein the polymer composition (PC) is post industrial and / or post consumer waster, preferably comprises one or more selected from mattress, cushions, insulation, interior lining of motor vehicles, seat covers, furniture, acoustic elements and bike saddles or parts thereof. The process according to any one of embodiments 67 to 72, wherein polyurethane (PU1) or polyurethane (PU2) is a soft and / or flexible foam, preferably a foam with a density in the range of from 45 to 400 g / l.74. The process according to any one of embodiments 67 to 73, wherein the polymer composition (PC) comprises one or more thermoplastic(s), thermoset(s) and / or elastomer(s), preferably thermoplastic(s) and / or thermosets), more preferably thermoset(s).75. The process according to any one of embodiments 67 to 74, wherein polyurethane (PU1) or polyurethane (PU2) is a thermoplastic polyurethane.76. The process according to any one of embodiments 67 to 75, wherein polyurethane (PU1) and polyurethane (PU2) are parts of one composite element.77. The process according to any one of embodiments 67 to 76, wherein polyurethane (PU1) and polyurethane (PU2) have the same chemical composition.78. The process according to any one of embodiments 67 to 77, wherein the content of ester based polyurethanes in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition.79. The process according to any one of embodiments 67 to 78, wherein the content of polyesters in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition.80. The process according to any one of embodiments 67 to 79, wherein the content of pigments and fillers in polyurethane (PU-1) and polyurethane (PU-2) is less than 5% by weight81. The process according to any one of embodiments 67 to 12, wherein the melting point of polyurethane (PU1) and the melting point of polyurethane (PU-2) is below 250°C, preferably below 200°C.82. Process, preferably according to any one of embodiments 1 to 81 , comprising the step: converting a chemical material obtainable by or obtained by the process according to any one of embodiments 1 to 81 and / or the composition Q obtainable by or obtained by the process according to any one of embodiments 1 to 81 to obtain a product.83. The process according to embodiment 82, wherein the product is selected from:I) building block or monomer; or ii) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; or ill) cleaning polymer, cleaning surfactant, descaling compound, cleaning biocide or composition or formulation thereof; oriv) agrochemical composition, agrochemical formulation auxiliary or agrochemically active ingredient; or v) active pharmaceutical ingredient or intermediate thereof, pharmaceutical excipient, animal feed additive, human food additive, dietary supplements, aroma chemical or aroma composition; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acrylate hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curable acrylic polymer for hot melts and coatings polyisocyanates, hyperbranched polyester polyol, polymeric dispersant for inorganic binder compositions, unsaturated polyester polyol or 100% curable composition; or vii) cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.84. The process according to any one of embodiments 82 to 83, wherein the content of the polymer composition (PC) in the product is 1 weight-% or more, preferably 2 weight-% or more, more preferably 5 weight-% or more, more preferably 15 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 60 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or wherein the content of the polymer composition (PC) in the product is 100 weight-% or less, preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 50 weight-% or less, more preferably 25 weight-% or less, more preferably 10 weight-% or less; and preferably wherein the content is determined based on identity preservation and / or segregation and / or mass balance and / or book and claim chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.85. A product obtained or obtainable according to the process according to any one of embodiments 1 to 84.The invention is further illustrated by the following examples.EXAMPLESA mixture of polyurethanes (40 weight-%) comprising a polyurethane prepared from a polyether polyole and methylene diphenyl diisocyanate (MDI) and a polyurethane prepared from a polyether polyole, toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI) was mixed and kneaded with a polyol (60 weight-%; Lupranol 2095) in an extruder (Xplore; Micro Compounder) and heated to 200°C for 5 minutes to obtain a mixture comprising a high recycling content. Mixing the obtained mixture comprising a high recycling content with a methylene diphenyl diisocyanate (MDI) leads to a polyurethane comprising a high recycling content.Literature cited:US 2023264391 A1 "Kunststoffhandbuch, Band 7, Polyurethane” [Plastics Handbook, volume 7, Polyurethanes], Carl Hanser Verlag, 3rd edition 1993, chapter 3.1

Claims

Claims1 . A process for treating a polymer composition (PC), comprising a polyurethane mixture (M-PU) in an amount from 30 to 100 % by weight based on the weight of the polymer composition (PC), the mixture (M-PU) comprising, preferably consisting of at least a polyurethane (PU1) and a polyurethane (PU2), and wherein polyurethane (PU1) and (PU2) differ in one or more of the following properties P1 :(a) the density, and(р) the chemical composition; and wherein polyurethane (PU1) and (PU2), preferably the mixture (M-PU), exhibit(s) one or more of the following properties P2:(a) the melting point is 300°C or less, preferably 250°C or less, more preferably 200 °C or less;(b) the average molecular weight of the polyol used for the preparation of the polyurethane is in the range of from 500 to 8000 g / mol, preferably 1000 to 6000 g / mol, more preferably 2000 to 5000 g / mol;(с) the content of chain extender in the polyurethane is 5 weight-% or less;(d) the content of glass fibers is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(e) the content of carbon black is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(f) the content of black paste is 5 weight-% or less, preferably 2 weight-% or less, more preferably is 0 weight-%, more preferably 0.0 weight-%, more preferably 0.00 weight-%;(g) the content of polyester based polyurethane is 5 weight-% or less, preferably in the range of from 0.1 to 5 weight-%; the process comprising(I) providing the polymer composition (PC);(II) subjecting the polymer composition (PC) to a recycling process selected from melting, depolymerizing, gasifying and pyrolyzing.

2. The process according to claim 1 , wherein step (II) comprises a melt emulsification comprising mixing the polymer composition (PC) and a dispersion medium and forming a mixture; shearing the mixture to form a dispersion of droplets of the composite in a liquid phase under a temperature of 160 to 250 °C; cooling the dispersion under a temperature of 0 to 100 °C and obtaining a polymer polyol..

3. The process according to claim 1 or 2, wherein step (II) comprises the steps of(I) melting the polymer composition (PC);(II) mixing the melt with a compound (C) to obtain a mixture (M1);(ill) preferably reacting the mixture (M1) with a compound comprising isocyanate.

4. The process according to any one of claims 1 to 3, wherein the polymer composition (PC) comprises one or more solvents.

5. The process according to any one of claims 1 to 4, wherein mixture (M-PU) comprises polyurethanes in an amount of 80 to 100 % by weight based on the mixture (M-PU).

6. The process according to any one of claims 1 to 5, wherein the polymer composition (PC) is part of waste stream (W) in particular wherein the polymer composition (PC) is post industrial and / or post consumer waster, preferably comprises one or more selected from mattress, cushions, insulation, interior lining of motor vehicles, seat covers, furniture, acoustic elements and bike saddles or parts thereof.

7. The process according to any one of claims 1 to 6, wherein polyurethane (PU1) or polyurethane (PU2) is a soft and / or flexible foam, preferably a foam with a density in the range of from 45 to 400 g / l.

8. The process according to any one of claims 1 to 7, wherein the polymer composition (PC) comprises one or more thermoplastic(s), thermoset(s) and / or elastomer(s), preferably thermoplastic(s) and / or thermoset(s), more preferably thermoset(s).

9. The process according to any one of claims 1 to 8, wherein polyurethane (PU1) or polyurethane (PU2) is a thermoplastic polyurethane.

10. The process according to any one of claims 1 to 9, wherein the content of ester based polyurethanes in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition.11 . The process according to any one of claims 1 to 10, wherein the content of polyesters in the polymer composition (PC) is less than 10% by weight based on the weight of the polymer composition.

12. The process according to any one of claims 1 to 11, wherein the content of pigments and fillers in polyurethane (PU-1) and polyurethane (PU-2) is less than 5% by weight13. The process according to any one of claims 1 to 12, wherein the melting point of polyurethane (PU1) and the melting point of polyurethane (PU-2) is below 250°C, preferably below 200°C.

14. A process according to any one of claims 1 to 13, wherein in the recycling process a composition Q is formed.

15. Process, preferably according to any one of claims 1 to 14, comprising the step:converting a chemical material obtainable by or obtained by the process according to any one of claims 1 to 14 and / or the composition Q obtainable by or obtained by the process according to any one of claims 1 to 14 to obtain a product.